Search results
Results from the WOW.Com Content Network
Philips' Planisphere, ca. 1900. In astronomy, a planisphere (/ ˈ p l eɪ. n ɪ ˌ s f ɪər, ˈ p l æ n. ɪ-/) is a star chart analog computing instrument in the form of two adjustable disks that rotate on a common pivot. It can be adjusted to display the visible stars for any time and date.
The history of Europe is traditionally divided into four time periods: prehistoric Europe (prior to about 800 BC), classical antiquity (800 BC to AD 500), the Middle Ages (AD 500–1500), and the modern era (since AD 1500). The first early European modern humans appear in the fossil record about 48,000 years ago, during the Paleolithic era.
The date of drawing was formerly estimated at c. 992–994 CE, based on suggested links to the journey of Archbishop Sigeric of Canterbury from Rome [25] but more recent analysis indicates that, although the information was revised about that time, the map was probably drawn between 1025 and 1050.
1577–80 – Taqi al-Din invents a mechanical astronomical clock that measures time in seconds, one of the most important innovations in 16th-century practical astronomy, as previous clocks were not accurate enough to be used for astronomical purposes. [13] 1577–80 – Taqi al-Din invents framed sextant [13]
The Planisphere of Domingos Teixeira is a hand-painted parchment map of the world made by a Portuguese cartographer in 1573, during the reign of Sebastian of Portugal. It is conserved in the Bibliothèque nationale de France .
For events dating from the formation of the planet to the rise of modern humans see: Timeline of natural history, Timeline of the evolutionary history of life and Timeline of human evolution. For events dating from the first appearance of Homo sapiens to before the invention of writing see: Timeline of prehistory
On the hour, Death strikes the time, and the twelve apostles appear at the doors above the clock. Olomouc. The Olomouc astronomical clock at the Town Hall is a rare example of a heliocentric astronomical clock. Dated 1422 by legend, but first mentioned in history in 1517, the clock was remodelled approximately once every century; in 1898 the ...
Planisphere or Planisphaerium, a 2nd-century AD book by Claudius Ptolemy about mapping the celestial sphere onto a flat plane using the stereographic projection to make a star chart Planispheric astrolabe , a device consisting of a planisphere joined to a dioptra, used for observing stars and performing astronomical calculations